Retro Theory
@retrotheory.bsky.social
Playing with old computers, breaking them, maybe fixing them.
Pico-mac with audio has been published
github.com/retrotheory/...
This is for Pico 2, not tested on Pico 1.
PWM or DAC based audio configure at build time.
Includes work on the submodule
github.com/retrotheory/... ,updated for 464K support and patched audio addressing.
github.com/retrotheory/...
This is for Pico 2, not tested on Pico 1.
PWM or DAC based audio configure at build time.
Includes work on the submodule
github.com/retrotheory/... ,updated for 464K support and patched audio addressing.
May 7, 2026 at 5:52 PM
Pico-mac with audio has been published
github.com/retrotheory/...
This is for Pico 2, not tested on Pico 1.
PWM or DAC based audio configure at build time.
Includes work on the submodule
github.com/retrotheory/... ,updated for 464K support and patched audio addressing.
github.com/retrotheory/...
This is for Pico 2, not tested on Pico 1.
PWM or DAC based audio configure at build time.
Includes work on the submodule
github.com/retrotheory/... ,updated for 464K support and patched audio addressing.
PicoMac Pico2 / 464K with Audio
Patched the ROM too override of memory size, and skip memory test.
Audio Output is 8bit PWM at 22,254 Hz, One sample per scanline, 3-bit volume control (0-7) via VIA Port A bits 0-2
With 464K I had to do shenanigans to get sound buffer in 'right place'
Patched the ROM too override of memory size, and skip memory test.
Audio Output is 8bit PWM at 22,254 Hz, One sample per scanline, 3-bit volume control (0-7) via VIA Port A bits 0-2
With 464K I had to do shenanigans to get sound buffer in 'right place'
May 3, 2026 at 3:26 PM
PicoMac Pico2 / 464K with Audio
Patched the ROM too override of memory size, and skip memory test.
Audio Output is 8bit PWM at 22,254 Hz, One sample per scanline, 3-bit volume control (0-7) via VIA Port A bits 0-2
With 464K I had to do shenanigans to get sound buffer in 'right place'
Patched the ROM too override of memory size, and skip memory test.
Audio Output is 8bit PWM at 22,254 Hz, One sample per scanline, 3-bit volume control (0-7) via VIA Port A bits 0-2
With 464K I had to do shenanigans to get sound buffer in 'right place'
Ok, I have brought BigMaclock to After Dark screensaver
github.com/retrotheory/...
Thanks @paulrickards.bsky.social for the AD idea and thanks @kalleboo.bsky.social for pointer on what I was doing wrong.
Now with Inversion Timer (phosphor protection)
Thanks for idea @thetechknight.bsky.social
github.com/retrotheory/...
Thanks @paulrickards.bsky.social for the AD idea and thanks @kalleboo.bsky.social for pointer on what I was doing wrong.
Now with Inversion Timer (phosphor protection)
Thanks for idea @thetechknight.bsky.social
April 4, 2026 at 1:53 PM
Ok, I have brought BigMaclock to After Dark screensaver
github.com/retrotheory/...
Thanks @paulrickards.bsky.social for the AD idea and thanks @kalleboo.bsky.social for pointer on what I was doing wrong.
Now with Inversion Timer (phosphor protection)
Thanks for idea @thetechknight.bsky.social
github.com/retrotheory/...
Thanks @paulrickards.bsky.social for the AD idea and thanks @kalleboo.bsky.social for pointer on what I was doing wrong.
Now with Inversion Timer (phosphor protection)
Thanks for idea @thetechknight.bsky.social
Reposted by Retro Theory
And here it is, the #marchintosh #globaltalk Canvas timelapse. Thank you to everyone who participated, it was lots of fun to host!
April 1, 2026 at 11:44 AM
And here it is, the #marchintosh #globaltalk Canvas timelapse. Thank you to everyone who participated, it was lots of fun to host!
Failing hard at this, trying to convert my BigMaclock to screensaver module for After Dark and I cannot get it to animate/update , so it just shows the static time. I think I'm right setting Cals 1 resource to 0x0f , but I think AD is catching quickdraw updates , need to find more info
March 31, 2026 at 6:34 PM
Failing hard at this, trying to convert my BigMaclock to screensaver module for After Dark and I cannot get it to animate/update , so it just shows the static time. I think I'm right setting Cals 1 resource to 0x0f , but I think AD is catching quickdraw updates , need to find more info
Reposted by Retro Theory
Reviving a sad Macintosh Plus for #MARCHintosh and its 40th. Playing games, exploring drives, letting it moonlight as a big Maclock, and hopping online with a BlueSCSI.
Watch - youtu.be/qFYbTqF4pmM
Watch - youtu.be/qFYbTqF4pmM
March 13, 2026 at 1:27 AM
Reviving a sad Macintosh Plus for #MARCHintosh and its 40th. Playing games, exploring drives, letting it moonlight as a big Maclock, and hopping online with a BlueSCSI.
Watch - youtu.be/qFYbTqF4pmM
Watch - youtu.be/qFYbTqF4pmM
Reposted by Retro Theory
I love to check the time on my SE/30, courtesy of @retrotheory.bsky.social's BigMaclock 😎
github.com/retrotheory/...
#marchintosh
github.com/retrotheory/...
#marchintosh
March 17, 2026 at 8:31 PM
I love to check the time on my SE/30, courtesy of @retrotheory.bsky.social's BigMaclock 😎
github.com/retrotheory/...
#marchintosh
github.com/retrotheory/...
#marchintosh
Source code added github.com/retrotheory/...
March 17, 2026 at 11:01 AM
Source code added github.com/retrotheory/...
Sometimes my Macs just wont Appletalk to each other. SE/30 gets quite cross with its older sibling. #MARCHintosh
March 16, 2026 at 6:45 PM
Sometimes my Macs just wont Appletalk to each other. SE/30 gets quite cross with its older sibling. #MARCHintosh
Reposted by Retro Theory
March 15, 2026 at 4:50 PM
Another #MARCHintosh project, a serial digital multimeter logger , in this case a UT61E. Its very work in progress and tough work for the 68000 of the Macintosh Plus.
March 12, 2026 at 7:11 PM
Another #MARCHintosh project, a serial digital multimeter logger , in this case a UT61E. Its very work in progress and tough work for the 68000 of the Macintosh Plus.
Reposted by Retro Theory
One man's trash: The journey of neglected compact Macs
YouTube video by THEtechknight
youtu.be
March 6, 2026 at 2:51 AM
More on what @mac84.bsky.social suggested, temp being a weather symbol. Making a weather symbol in 5x7 'pixels' is kinda meh. So I though make it the same width as the DAY, so 18x11. It needs some work , not bad for first pass. At the moment , its click to change. And saves to prefs.
March 4, 2026 at 7:38 PM
More on what @mac84.bsky.social suggested, temp being a weather symbol. Making a weather symbol in 5x7 'pixels' is kinda meh. So I though make it the same width as the DAY, so 18x11. It needs some work , not bad for first pass. At the moment , its click to change. And saves to prefs.
YES!
March 4, 2026 at 6:54 PM
YES!
Give github.com/retrotheory/... BigMaclock a try, It supports dynamic pixel sizing so you can run it on a larger screen. #MARCHintosh
March 1, 2026 at 6:03 PM
Give github.com/retrotheory/... BigMaclock a try, It supports dynamic pixel sizing so you can run it on a larger screen. #MARCHintosh
Instead of turning a clock into a vintage Mac, I turned a vintage Mac into a clock!, I though it would be fun given its #MARCHintosh The program can be downloaded here: github.com/retrotheory/...
It supports US/EU month day order AM/PM, Invert display, 'grey' background and alarm function
It supports US/EU month day order AM/PM, Invert display, 'grey' background and alarm function
March 1, 2026 at 5:51 PM
Instead of turning a clock into a vintage Mac, I turned a vintage Mac into a clock!, I though it would be fun given its #MARCHintosh The program can be downloaded here: github.com/retrotheory/...
It supports US/EU month day order AM/PM, Invert display, 'grey' background and alarm function
It supports US/EU month day order AM/PM, Invert display, 'grey' background and alarm function
At 40 years old, this Macintosh Plus is officially living its best life: no social media, no notifications, and zero concept of "The Cloud"—just a physical box of floppies and dreams
February 11, 2026 at 12:03 PM
At 40 years old, this Macintosh Plus is officially living its best life: no social media, no notifications, and zero concept of "The Cloud"—just a physical box of floppies and dreams
Wow!
May 6, 2025 at 8:06 PM
Wow!
Reposted by Retro Theory
my most epic monitor repair to date. Snapped in 5 places, 105 traces repaired...
youtu.be/Dsje26clJ-Q
#amiga #commodore #crt #RetroComputing
youtu.be/Dsje26clJ-Q
#amiga #commodore #crt #RetroComputing
Broken Commodore 1085s epic repair
YouTube video by The 8-Bit Manshed
youtu.be
January 15, 2025 at 7:10 PM
my most epic monitor repair to date. Snapped in 5 places, 105 traces repaired...
youtu.be/Dsje26clJ-Q
#amiga #commodore #crt #RetroComputing
youtu.be/Dsje26clJ-Q
#amiga #commodore #crt #RetroComputing
Picked up an old soldering station from a junk yard in Mos Eisley, seems to be stuck in Aurebesh mode.
January 7, 2025 at 5:31 PM
Picked up an old soldering station from a junk yard in Mos Eisley, seems to be stuck in Aurebesh mode.
December 22, 2024 at 4:44 PM
Reposted by Retro Theory
December 18, 2024 at 11:49 AM
Reposted by Retro Theory
No love from @hackaday-feed.bsky.social on my latest project. Maybe repost to let them know I’m not dead.
December 16, 2024 at 8:20 PM
No love from @hackaday-feed.bsky.social on my latest project. Maybe repost to let them know I’m not dead.
Late 1960s early 1970s analog electronics was so colourful.
December 13, 2024 at 11:12 PM
Late 1960s early 1970s analog electronics was so colourful.